Features simple, one-handed operation to adjust the viewing angle. Securely holds the unit in place, no matter the boating conditions. No knobs to tighten or multiple joints to move. Mounts keep the electronic units close to the boat, not "out-on-a-limb" where vibration and rough water can make viewing the unit virtually impossible. Every model features a fully rotational swivel top that automatically locks in its turned position and can be removed by using its patented top removal feature to allow for storage of the unit. Mounts are injection molded from DuPont 6/6 Nylon material and assembled w/ stainless steel springs and screws. JR-300, JR-400 & JR-500: 45 position automatically locking swivel top. Push-button top removal mechanism. Low profile design - only1-1/4'' tall. Supports weights up to 7 lbs. JR-203: 30 position automatically locking swivel top. Snap On/Off top removal mechanism. Supports up to 10 lbs. mounted upright & 7 lbs. mounted upside down. JR-206: 24 position automatically lock

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